Pulverized fuel burner



ay 22, 1934.. Q, MELLDTT PULVERIZED FUEL BURNER Filed June 20, 1929 2 Sheets-Sheet l INVENTOR @W ATTORNEYS.

y 1934- Q. MELLOTT PULVEHIZED FUEL BURNER Filed June 20, 1929 2 Sheets-Sheet 2 FIQB.

FIG. 3

Z INVENTOR BY W ATTORNEYS.

Patented May 22, 1934 UNITED STATES FATE UFFTQE Oscar Mellott, Allentown, Pa., assignor to Fuller Lehigh Company, Fullerton, Pa., a corporation of Delaware Application June 20, 1929, Serial No. 372,243

m 6 Claims.

This invention relates to a novel and improved form of pulverized fuel burner, the novel features of which will be best understood from the following description and the annexed drawings,

'55 in which there is shown a selected embodiment of the invention and in which;

Fig. 1 is a longitudinal sectional view through a burner constructed according to my invention.

Fig. 2 is a section on the line 22 of Fig. 1,

i :10 and Fig. 3 is a section on the line 3-3 of Fig. 1.

The burner is used in connection with any suitable furnace, and is adapted to discharge the fuel through a hole in the wall of such a furnace. In Fig. 1 the inner surface 1 of a furr 1 nace wall is indicated, this wall having therethrough a hole 2 through which the pulverized fuel may be discharged. The burner is disposed outside of the furnace wall adjacent this hole in the usual manner. The burner consists of a Z2520 casing 3 forming a duct through which air may be supplied to the hole 2, this air coming through the vertical leg 4 of the duct and being discharged in the opening from the horizontally extending leg 5 of the same duct.

Extending into the casing substantially centrally thereof is the fuel pipe 6 having its end 7 disposed adjacent the hole through the wall, so that fuel from the end '7 may be discharged into the furnace. Extending through the pipe 6 is a support 8 having on its inner end a deflector 9 in the form of spirally arranged blades which are in position to be struck by fuel issuing from the pipe and to give to this fuel a spiral or whirling motion as it enters the furnace. This support 8 may be adjusted lengthwise of the pipe by any suitable and usual means. Disposed in the pipe is a disc 10 having an opening therethrough and which is adapted to be adjusted by oppositely disposed screws 11 in a manner more fully set forth and claimed in the copending application of Ralph M. Hard'grove, Serial No. 292,148.

Disposed within the hole 2 is an annular ring formed of refractory material here shown as segmental tile 12, this tile being shown as forming a ring 13 concentric with the pipe 6 and terminating in a curved flaring portion 14 opening into the furnace. Outwardly of the ring 13 is an abrupt shoulder 14 against which the stream of air flowing through the duct impinges, this abrupt shoulder serving to deflect the stream of air towards the pipe, the air then passing through the ring into the furnace and mixing with the stream of fuel. This mixing may take place before the fuel strikes the deflector 9, de-

pending upon the poistion of the deflector with respect to the end of the pipe 6.

I claim:--

1. A furnace wall having a fuel burner port formed therein, a ring having a sharp edged an- 1 nular shoulder formed thereon and arranged in said port, and a fuel pipe outside of said ring having its discharge end slightly spaced therefrom in combination with means for directing air into said port toward the opening in said ring, the sharp edged annular shoulder on said ring being arranged to deflect the air inwardly toward the end of said fuel pipe.

2. A furnace wall having a fuel burner port formed therein, a ring having a sharp edged an- -1 nular shoulder formed thereon and arranged in said port, and a fuel pipe outside of said ring having its discharge end slightly spaced therefrom, in combination with means for directing air into said port toward the opening in said ring, Z the sharp edged annular shoulder on said ring being arranged to deflect the air inwardly toward the end of said fuel pipe, and a deflector in front of the end of said fuel pipe for causing additional turbulence in the fuel and air project-. 8 ed into the furnace through said ring.

3. In a fuel burner, a ring having a sharp internal edge forming a shoulder thereon, a fuel pipe having its end adjacent the shoulder on said ring and an air casing surrounding said fuel pipe, in combination with means for impellng air through said casing toward said ring, the shoulder on said ring serving to deflect the air inwardly toward said fuel pipe and to give the air turbulence in passing through said ring. 39

4. In a fuel burner, a ring having a sharp internal edge forming a shoulder thereon, a fuel pipe having its end adjacent the shoulder on said ring, and an air casing surrounding said fuel pipe, in combination with means for impelling 9 air through said casing toward said ring, the shoulder on said ring serving to deflect the air inwardly toward said fuel pipe and to give the air turbulence in passing through said ring, and an adjustable deflector coaxial with said fuel piper; disposed beyond its end within said ring.

5. In a furnace, a wall, an orifice structure in said wall formed with an abrupt internal angle on its side away from said furnace and spaced inward from the outer surface of said wall, a fuel; 1 discharge pipe adjacent the abrupt angle in said orifice structure and spaced therefrom, and means for supplying air to the side of said orifice structure away from the furnace, the abrupt angle in said orifice structure being constructed;

and arranged to cause a sharp angular direction change in the air entering the furnace as the air comes in contact with the fuel stream leaving said fuel discharge pipe.

6. In combination, a furnace wall having a passage therethrough forming a fuel burner port, a fuel burner positioned centrally and axially of said passage and having its discharge end terminating short of the furnace end of said passage, means for delivering air for combustion under pressure to the space between said fuel burner and the walls of said passage, and an orifice member positioned transversely in said passage at the OSCAR MELLOTT.

not 

